What does sound look like?

3 minutes

Is it possible to see sound? Yes, but it takes some crafty photographic wizardry

The concept of ‘seeing sound’ might seem preposterous, but when you consider that sound is just compressed air travelling in waves, the idea becomes a bit more logical. The real trick is capturing air flow in a way that makes it perceptible to the human eye. Through some clever tricks, scientists are able to do just that using a technique called Schlieren flow visualisation, which is used to study everything from heat and sound to aerodynamics and the spread of disease.

Producer: Adam Cole

Video by NPR’s Skunk Bear

Video/Music

Melody, rhythm and piety: the rich forms and meanings of Indian classical music

17 minutes

ORIGINAL
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If soldiers act with unjust aggression they are as culpable as civilian criminals

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Essay/Biology

The queen does not rule

The ant colony has often served as a metaphor for human order and hierarchy. But real ant society is radical to its core

Deborah M Gordon

Video/Evolution

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4 minutes